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  1. Helper T cells are essential in determining B cell antibody class switching, in the activation and growth of cytotoxic T cells. So T helper cells regulate the activation of both cytotoxic T cells and antibody...

    2 Answers · Science & Mathematics · 23/11/2007

  2. An antigen is a foreign protein (such as bacteria or virus). I called it foreign because it is not a normal part of your body. Your cell membranes are designed to recognize that those substances are foreign...

    3 Answers · Science & Mathematics · 28/07/2009

  3. You don't get the same virus/sickness more than once. Everytime you get a cold or flu it is caused by a different type of virus. The same type of virus cannot make you sick more than once.

    2 Answers · Health · 14/06/2013

  4. a vaccine is a synthetic bacteria. a specific vaccine has the same structure of the bacteria that you want to be immune from. your antibodies will then record the structure of the vaccine so that when you can acquire that bacteria, your body will be able to produce...

    1 Answers · Health · 22/05/2012

  5. I'm pretty sure its mutations, mutations create the new species.

    1 Answers · Health · 13/11/2011

  6. only if it's the same strain. Usually it changes every year. They base the flu shot on the virus strain that was most popular the year before. Most of the time a new strain comes a long and the shot doesn't help as well.

    5 Answers · Health · 07/07/2007

  7. ...) titers are also seen in chronic infection (and in acute infection). Only with immunity due to natural infection that has resolved, or with immunity due to immunization...

    4 Answers · Health · 15/03/2014

  8. If you have an infection, your immunity system is fighting it and your body...a larger area, get to a doctor quickly. An infection can cause a lot of damage to different parts of the body...

    1 Answers · Health · 02/05/2011

  9. Immunity is the ability of the body to resist an infection of pathogen by producing a specific antibody. A...of serum containing antibodies to acquire immunity. VACCINE is a suspension of bacteria...

    2 Answers · Science & Mathematics · 12/10/2011

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